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. 2015 Mar 19;3:24. doi: 10.3389/fbioe.2015.00024

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Copyright © 2015 Lee, Richtsmeier and Kraft.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Lateral view of a 3D domain. The relative distance from inferior surface of the domain (x_rel) and reference position (x_ref) are indicated. Our model limits differentiation to those cells below the reference position.